CHECK VALVE Russian patent published in 2024 - IPC F16K15/04 F04B53/10 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry, in particular to the reciprocating-action borehole pumps check valves. Check valve consists of two balls and one common seat. At each cycle the balls are changed with each other, thus increasing the service life of the check valve. Section of the check valve with variable geometry can be made monolithic or assembled and can be made of metal, polymer or elastic. Anti-adhesion coating against asphaltene sediments is applied on the inner surface of the section of the check valve with variable geometry.

EFFECT: when using balls of different diameters and a double seat with different diameters of seating and cyclic change of the operating pair "ball-seat", the service life of the check valve is increased; it is possible to install a check valve, as well as a valve seat at different angles relative to the well axis to reduce the check valve closing delay and increase the pump filling factor.

7 cl, 17 dwg